Umarex Colt Single Action Army .177 Cal Pellet Airgun Package (500 RWS Meisterkugeln .177 Pellets & 5 Pack of 12g CO2 Cartridges) Includes: 6 Shells, 500ct .177 Pellet (BRAND MAY VARY) + 5PK 12gr CO2 FPS w/Lead Pellet: 380-410 Full Metal - Realistic Action Caliber: 0.177 (4.5mm) Pellet. Power: 12 gr CO2 Cartridge